Yii Widgets And More !

The Best User Management & RBAC Module:

http://www.yiiframework.com/extension/cruge/

Ajax jQuery File Upload Widget:

http://www.yiiframework.com/extension/coco/

CSV Export:

http://www.yiiframework.com/wiki/401/simple-csv-export/

Complex Widgets / Bussiness Case:

http://www.yiiframework.com/extension/eyui/